Figure 2
L-COSY spectra from healthy control (left) and athlete with a history of repetitive brain trauma (RBT; right). Spectroscopy was performed at 3T using a 32 channel head coil and voxel size of 3 × 3 × 3 cm3 in the posterior cingulated gyrus; increment size 0.8 ms; 64 increments with 8 averages resulting in an acquisition time of 12.8 minutes; acquired vector 1,024 points; acquisition time 512 ms; spectral width in F2 2,000 Hz and spectral width in F1 1,250 Hz. For presentation the spectra were calibrated to the lysine cross peak at 3.00 to 1.67 ppm. Asp, aspartate; Cho, choline; Cr, creatine; Fuc, fucose; GABA, gamma-aminobutyric acid; Glx, glutamate/glutamine; Lys, lysine; m1, macromolecule; mI, myo-insitol; NAA, N-acetyl aspartate; Thr, threonine.